You have just landed on Planet X. You release a 180 gg ball from rest from a height of 10.0 mm and measure that it takes 3.40 ss to reach the ground. Ignore any force on the ball from the atmosphere of the planet. A. How much does the 180 gg ball weigh on the surface of Planet X? Express your answer with the appropriate units

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Proper Length

The theory of special relativity explains the connection between space and time to objects that move in a straight line at a constant speed. The objects move at the speed of light. When an object approaches light speed, its mass is endless and cannot move faster than light. The most crucial postulate of Einstein's special relativity is that the laws of nature do not change in each frame of reference.